滑动概率尺度范围之间随机选择一个数字 [英] Sliding probability scale for randomly picking a number between a range

问题描述

比方说，我有很多钱，我想给在之间$ 500和$ 5,000个随机的增量。我想的范围内的下端为比较高的范围更为可能。什么是最有效的算法，我可以用Ruby写随机发放现金以这种方式？

Let's say I have lots of cash I want to give out in random increments between $500 and $5,000. I'd like the lower end of the range to be much more probable than the higher range. What's the most efficient algorithm I can write in Ruby to randomly hand out cash in this manner?

推荐答案

我觉得最简单的方法就是只使用case语句：

I think the easiest way is to just use the case statement:

def get_price
  case rand(100) + 1
    when  1..50  then 500 
    when 50..75  then 1000
    when 75..99  then 2500
    when 99..100 then 10000
  end
end

p get_price # => 500

调用get_price将返回500以50％的概率，但时间万才会返回2％

Calling get_price will return 500 with 50% probability but 10000 will only be returned 2% of the time.

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